Docosanol is used to treat "cold sores/fever blisters" (herpes labialis). It can speed up healing of the sores and decrease symptoms (such as tingling, pain, burning, itching). It works by blocking the virus that causes the cold sores (herpes simplex) from entering the healthy skin cells and growing in number. This medication does not cure herpes and does not prevent passing the infection to someone else. It does not prevent a future occurrence.
Follow all directions on the product package, or use as directed by your doctor. Use this medication at the first signs of a cold sore (such as tingling, burning, redness, or a bump). Wash and dry your hands before applying the medication. Clean and dry the affected areas. Apply a thin layer of medication to completely cover the area of the cold sore or the area of tingling/itching/redness/swelling and rub in gently, usually 5 times a day every 3-4 hours, or as directed by your doctor. Wash your hands with soap and water after applying. If you are uncertain about any of the information, consult your doctor or pharmacist.
Apply to skin only. Do not apply this medication in or near the eyes since this medication can irritate the eyes. If you do get medication in your eyes, flush with plenty of water. Do not apply inside the mouth or nose.
Remove any cosmetics from the affected area before applying. You may apply cosmetics after applying but use a separate applicator (such as a disposable cotton swab) on infected areas to prevent spreading the infection. If you accidentally wipe off the medication, reapply as soon as possible.
Dosage is based on your medical condition, type of infection, and response to treatment. Do not use this drug more often or for longer than directed.
Use this medication regularly to get the most benefit from it. This medication works best when the amount of drug absorbed by the skin stays at a constant level. Therefore, use this drug at evenly spaced intervals. To help you remember, use it at the same times each day.
Cold sores (herpes) can spread easily. Docosanol does not prevent the spread of herpes. Avoid close physical contact with others (such as kissing) during an outbreak until the cold sores have completely healed. Also, try not to touch the cold sore, and wash your hands if you do touch the cold sore.
Stop using this medication and tell your doctor if your cold sores worsen or persist for more than 10 days.
Redness or swelling may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
If your doctor has directed you to use this medication, remember that he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Before using docosanol, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.
If you are using this product under your doctor's direction, your doctor or pharmacist may already be aware of possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first.
Keep a list of all your medications with you, and share the list with your doctor and pharmacist.
This medicine may be harmful if swallowed. If swallowing or overdose is suspected, contact a poison control center or emergency room right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.
Do not share this medication with others. Doing so may spread the infection.
Cold sore outbreaks can be caused by many factors such as stress, hormonal changes (such as pregnancy, menstrual period), injury/surgery on the mouth (such as dental work), tiredness, sunlight, cold weather, or fever/cold/flu.
If you miss a dose, use it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.
Store at room temperature between 68-77 degrees F (20-25 degrees C). Protect from freezing. If you have any questions about storage, ask your pharmacist. Keep all drug products away from children and pets.
Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company for more details about how to safely discard your product.
Information last revised October 2015. Copyright(c) 2015 First Databank, Inc.
With WebMD's Medicine Cabinet, you can check interactions with drugs.Go to medicine cabinet